Beard straightener



FIG. 1 is a perspective view of a beard straightener showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broke lines in the drawings depict portions of the beard straightener that form no part of the claimed design. 

CLAIM The ornamental design for a beard straightener, as shown and described. 